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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
The value of restricted stock grants that vest based on market conditions is computed on the date of grant using the Monte Carlo model with the following assumptions:
 
For the period ended June 30, 2018
Performance price target
$
5.25

 
$
6.00

 
$
7.00

Expected volatility
48.3
%
 
48.3
%
 
48.3
%
Interest rate
1.97
%
 
1.97
%
 
1.97
%
Expected life (years)
3

 
3

 
3

Dividend yield
%
 
%
 
%
NonVested Restricted Common Stock
 
Shares
 
Weighted
Average
Grant
Fair
Value
Balance, December 30, 2017
2,629,274

 
$
3.31

Granted
1,465,000

 
2.22

Forfeited
(572,025
)
 
4.12

Vested
(80,000
)
 
3.64

Balance, June 30, 2018
3,442,249

 
$
2.71

Stock-Based Compensation Expense
The following table summarizes stock-based compensation expense within each of the categories below as it relates to non-vested restricted common stock awards for the three and six months ended June 30, 2018 and July 1, 2017 (no tax benefits were recognized):
 
Three Months Ended
 
Six Months Ended
 
June 30, 2018
 
July 1, 2017
 
June 30, 2018
 
July 1, 2017
Cost of product revenues
$
155,925

 
$
159,081

 
$
266,151

 
$
263,174

Research and development
193,767

 
194,655

 
468,083

 
413,213

Selling, general and administrative
938,682

 
322,287

 
1,953,555

 
1,291,741

Total
$
1,288,374

 
$
676,023

 
$
2,687,789

 
$
1,968,128

Unr